Quote:
Originally Posted by Sh0velMan
A battery interrupt is the simplest, for sure.
I would love to be able to keep the ECU with at least standby power even when the kill switch is engaged, I just don't see how to accomplish that, unless we can figure out a way to power it through, for instance, the OBD II port.
I just hate to lose learned fuel data any time the car is killed.
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I'll try to do some more investigating this afternoon, but just off the top of my head:
I've been looking through the FSMs lately and think I remember seeing that the ECM has multiple power supply terminals. Not sure if that would present a problem, electrically, or not. If they are all in parallel, it shouldn't matter. Like I say, I need to do some more investigating.
The CAN bus will only supply a limited amount of power and I don't think it's a good idea to tamper with the CAN bus if it's not absolutely necessary. Plus, you would have to bypass the battery disconnect to power the CAN bus.
It _should_ be fairly easy to maintain power to the ECM. If nothing else, you can install a small 12V battery just for the ECM. The biggest problem I can see would be if diodes were required to prevent the new battery from trying to power to whole car when the disconnect is de-energized. Diodes have a voltage drop that may mess with the ECM. More investigation needed.
Hopefully, someone that has done this before will chime in soon.
